Heel-nail



(No Model.)

G. A. CURTIS. HEEL NAIL.

No. 515,952. Patented Mar. 6, 1894.

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UNITED v STATES PATENr rrircn.

GEORGE A. CURTIS, OF MALDEN, ASSIGNOR TO CHARLES F. BAKER, OF

' BOSTON, MASSACHUSETTS.

HEEL-NAIL.

SPECIFICATION forming part of Letters Patent No.5l5,952, dated March 6,1894. Application filed September 30,1393. fierial N0. 486,85- (Nomodel.)

To aZZ whom it may concern.-

Be it known that I, GEORGE A. CURTIS, of Malden, in the county ofMiddlesex and State of Massachusetts, have invented certain new anduseful Improvements in Heel-Nails, of which the following is aspecification.

This invention relates to heel nails which are used in blind nailing,the heads of the nails being embedded in the material of the top lift.

The invention has for its object to provide certain improvements innails of this class, such as shown in my Patent No. 502,550, grantedAugust 1, 1893, whereby the insertion of the head of the nail into thetop lift is facilitated and its hold on the top lift strengthened,making the top lift less liable to pull ofii than heretofore.

The invention consists in the improvements which I will now proceed todescribe and claim. 4 Y

Of the accompanying drawings forming a part of this specification,Figures 1, 2, 3 and 4 represent side views of heel nails embodying myimprovements. Fig. 5 represents an end elevation of the nail lookingonto the head thereof. Fig. 6 represents a section on line 6, 6, Fig. 2.Fig.7represents a sectional view of a portion of the heel, showing oneof my improved nails engaged with the heel.

The same letters and numerals of reference represent the same parts inall of the figures.

In the drawings or represents the shank or body of the nail, which ispreferably cylindrical and has an awl-shaped point at one end adapted toreadily penetrate the lifts of a heel without requiring the previousformation of a hole to receive it and also to readily turn and clinch asindicated in Fig. 7. On the other end of the shank is formed awedgeshaped head having the inclined sides 2, 2, the base of the headbeing preferably cylindrical and of greater diameter than that of theshank. The shank or body of the nail is provided just below the headwith grooves or recesses 3, 3, the upper ends 4:, l of which aresubstantially at a right angle with the length of the shank. Saidgrooves receive portions of the material of the top lift and enable thenail head to be securely engaged with said lift, the ends 4, i of thegrooves and the inclined sides 2, 2 of the heads forming barbs which arereadily engaged with the top lift, but are not so readily withdrawn ordisengaged.

It will be seen that the grooves or recesses formed in the sides of thenail give the head greater depth under sides 4:, 4 than it wouldotherwise possess, unless the diameter of the head were correspondinglyincreased. It is very desirable that the diameter of the head be reducedto as near the diameter of the shank as possible in order that the nailmay enter the dies of the prevailing types of heel nailing machines.This result is accomplished by making the grooves or recesses under thehead. I prefer to make said grooves by indenting the body of the nail atopposite sides without cutting away any of the material, so that thereare two grooves or recesses separated by the slight ridges or ribs 7which are the result of the displacement of the metal in forming thegrooves.

In Figs. 3, 4 and 7, I show the nail provided with a collar 8 locatedbelow the grooved or recessed portion, said collar being of the samediameter as the base of the head and formed to bear on the lift of theheel next the top lift, as shown in the above mentioned patent.

This improved nail is adapted to be made of wire.

A nail having awedge-shaped head with a cylindrical base which is ofgreater diameter than the body of the nail is new, so far as I am aware,and I therefore desire to cover the same broadly.

I claim-- A heel nail comprising in its construction a wedge-shapedcutting or penetrating head, extending diametrically across its end andthe base of which is cylindrical, and projects outwardly from the bodyof the nail on all sides and a cylindrical shank or body of lessdiameter than the base of the head, said shank being indented at twoopposite points under the lower ends of the inclined sides of the heads,to form recesses, the uppei' ends of two subscribing Witnesses, this 22dday of Sep- Which are substantially at right angles with tember, A. D.1893. the shank and with said inclined sides coni stitute barbs or acuteangled projections GEORGE (JURTIS' 5 adapted to engage a top lift, asset forth. WVitnesses:

In testimony whereof I have signed my C. F. BROWN,

name to this specification, in the presence of A. D. HARRISON.

